The Siemens 6GT2812-2EA01 is the RF622A UHF RFID antenna for the SIMATIC RF600 system, tuned for the US FCC band from 902 to 928 MHz. It is the antenna you pair with an RF600 reader when you need a rugged, IP65-rated external antenna for a fixed-mount RFID portal or conveyor gate. Linear polarization and a maximum VSWR of 2 mean the radiated pattern is predictable — you align the antenna's polarization to the tag's orientation for best read range. The 130° horizontal and 105° vertical beamwidth covers a wide zone, so a single antenna can illuminate a pallet or tote passing through a read portal.
The -20 to +70 °C operating range covers unheated warehouses and outdoor dock doors in most climates. The 0.3 m pigtail with an RP-TNC male connector is short — you will need an extension cable (the accessory list shows antenna cables from 1 to 40 m) to reach the reader. Mounting is via two M5 screws through the 76 mm square face, so the bolt pattern is standard for a small enclosure bracket or a custom arm. The 50 Ω impedance and max VSWR of 2 are typical for this class of panel antenna; the -5 dB gain at linear radiation is moderate, which keeps the FCC radiated power within limits without a separate attenuator in most installations.
The 6GT2812-2EA01 is an active, mature product in the Siemens RF600 family. There is no announced phase-out or last-time-buy, so it is a safe BOM line for new designs and ongoing MRO replenishment.